C34.30
BillableMalignant neoplasm of lower lobe, unspecified bronchus or lung
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 9 — Lung and Other Severe Cancers
0.973ESRDHCC 9 — Lung and Other Severe Cancers
0.000RxHCCHCC 20 — Cancer, Liver and Intrahepatic Bile Duct
0.000What This Code Means
Cancer that starts in the lower portion of the lung, but the specific side (left or right) is not specified.
Coding Tips
Clinical Significance
Lower lobe lung cancer without specified laterality represents a documentation gap. Lower lobe tumors account for approximately 30% of lung cancers and may be more difficult to detect on chest X-ray due to overlap with the diaphragm and cardiac silhouette. These tumors may present with pleural effusion.
Documentation Requirements
- ✓Pathology or imaging confirming lower lobe location
- ✓Evidence that laterality was sought but not available
- ✓Histological type and molecular markers
- ✓TNM staging with assessment for pleural involvement
- ✓Provider query documentation for laterality
Commonly Confused Codes
C34.31/C34.32 — Right/left lower lobe: Always assign laterality when documentedC34.90 — Lung, unspecified: C34.30 is more specific with lobar informationC38.4 — Malignant neoplasm of pleura: Lower lobe tumors may invade the pleura; code both if applicableC34.2 — Middle lobe (right only): Distinguish from right lower lobe tumors near the major fissure
Code Hierarchy
└C34Malignant neoplasm of bronchus and lung└C34.3Malignant neoplasm of lower lobe, bronchus or lung└C34.30Malignant neoplasm of lower lobe, unspecified bronchus or lung
└C34.30Malignant neoplasm of lower lobe, unspecified bronchus or lung